TWM521180U - Integrated type optical film and diffusion sheet thereof - Google Patents

Description

Integrated optical film and diffusion sheet thereof

The present invention relates to an optical film and a diffusion sheet thereof, and more particularly to an integrated optical film and a diffusion sheet for a backlight module of a flat display.

In a flat panel display, the backlight module functions to provide a flat panel display with a high brightness and high uniformity of the surface light source. The existing edge-lit backlight module includes a reflective mask, a light source disposed in the reflective mask, a light guide plate connected to the reflective mask and disposed on one side of the light source, and a bottom portion disposed on the bottom of the light guide plate. a reflective sheet, and a diffusion sheet, a concentrating sheet, and an upper concentrating sheet which are sequentially stacked from the light guiding plate.

When the light emitted from the light source is irradiated to the diffusion sheet through the light guide plate, the diffusion sheet uniformly diffuses the light, and then corrects the direction of the light through the condensing sheet and the upper condensing sheet to achieve concentrating and improving The purpose of brightness. However, the concentrating sheet of the backlight module is not hardened or atomized by the light incident surface, and is easily rubbed by the diffusion sheet during the assembly process, thereby causing scratches and affecting optical characteristics. In addition, optical films of backlight modules, such as concentrating sheets, are usually designed in a thinner direction to achieve weight reduction and improved product suitability. However, due to the poor structural strength of the thin concentrating sheet, the film deformation is easily caused by the external force, and the concentrating effect of the concentrating sheet is greatly reduced.

Therefore, the object of the present invention is to provide an integrated optical film which can avoid scratching of a concentrating sheet due to friction and which is less likely to be deformed by an external force during assembly of the backlight module.

Another object of the present invention is to provide a method for preventing the scratch of the concentrating sheet due to friction during assembly of the backlight module and to make the concentrating sheet less susceptible to external force when used in conjunction with a concentrating sheet. A film-forming diffusion sheet is produced.

The novel integrated optical film comprises a diffusion sheet and a concentrating sheet adhered to the diffusion sheet. The diffusion sheet includes a first substrate, and a diffusion layer viscous and disposed on the first substrate and having a diffusion microstructure. The concentrating sheet includes a second substrate adhered to the diffusion layer and a concentrating layer disposed on the second substrate and having a plurality of prisms.

In some implementations, the diffusion microstructure has a plurality of peaks formed toward the concentrating sheet, and a plurality of valleys formed toward the first substrate. The second substrate of the concentrating sheet is adhered to A portion of the peaks are not in contact with the valleys, and a plurality of diffusing spaces are defined together with the peaks and the valleys.

In some embodiments, the diffusion layer is comprised of an ultraviolet curable resin.

In some embodiments, the surface roughness of the diffusion layer is between 0.5 microns and 2.0 microns.

In some embodiments, the diffusion layer has a refractive index between 1.4 and 1.6.

In some embodiments, the diffusion layer has a refractive index between 1.45 and 1.55.

The tensile force required to tear the diffusion layer from the concentrating sheet is greater than 200 gf / 25 mm.

In some embodiments, the material of the first substrate is one of polyethylene terephthalate and polycarbonate.

The diffusion sheet is used for adhering to a concentrating sheet. The diffusion sheet comprises a first substrate, and a slab disposed on the first substrate and viscous for adhering to the concentrating sheet and having a diffusion microstructure. Diffusion layer.

In some implementations, the diffusion microstructure has a plurality of peaks formed toward the concentrating sheet for adhering to the concentrating sheet, and a plurality of recesses formed toward the first substrate and not contacting the concentrating light The valley of the film.

In some embodiments, the diffusion layer is comprised of an ultraviolet curable resin.

In some embodiments, the surface roughness of the diffusion layer is between 0.5 microns and 2.0 microns.

In some embodiments, the diffusion layer has a refractive index between 1.4 and 1.6.

In some embodiments, the diffusion layer has a refractive index between 1.45 and 1.55.

In some embodiments, the tensile force required to tear the diffusion layer from the concentrating sheet is greater than 200 gf / 25 mm.

In some embodiments, the material of the first substrate is one of polyethylene terephthalate and polycarbonate.

The effect of the novel is that the diffusion sheet and the concentrating sheet are closely adhered to each other through the viscous layer itself, and during the assembly process of the backlight module, the two are not caused by relative displacement and mutual friction between the two. The optical sheet is affected by scratches due to scratches.

Another effect of the present invention is that the diffusion sheet and the concentrating sheet are combined into a single integrated optical film, and the thickness of the single integrated optical film is relatively increased, so that the overall structural strength is relatively increased, so that it is less likely to be deformed by the external force.

Referring to FIG. 1, an embodiment of the integrated optical film of the present invention comprises a diffusion sheet 1 and a concentrating sheet 2 adhered to the diffusion sheet 1. The diffusion sheet 1 includes a first substrate 11 and a diffusion layer 12 disposed on the first substrate 11 and having a diffusion microstructure 121. The first substrate 11 includes an opposite light incident surface 111 and a light exit surface 112. A protective film can be disposed on the light incident surface 111 to provide a protective function when transporting and storing the diffusion sheet 1, but the diffusion sheet 1 is used. It must be removed. The diffusion layer 12 is disposed on the light-emitting surface 112 of the first substrate 11 and is composed of a viscous ultraviolet curing resin. The optical layer is an optical structure and an adhesive structure, and the refractive index is between 1.4 and 1.6. Jia is between 1.45 and 1.55. The diffusion microstructure 121 of the diffusion layer 12 has a plurality of peaks 122 formed to protrude away from the light-emitting surface 112, and a plurality of valleys 123 recessed toward the light-emitting surface 112. The peaks 122 and the peaks 122 The equal valley portion 123 is formed during the processing of the ultraviolet curable resin, and allows the diffusion sheet 1 to provide light diffusion.

The concentrating sheet 2 includes a second substrate 21 adhered to the diffusion layer 12, and a concentrating layer 22 disposed on the second substrate 21 and having a plurality of prisms 221 . The second substrate 21 is adhered to the portion of the peaks 122 and does not contact the valleys 123, and thus defines a plurality of diffusion spaces 124 together with the peaks 122 and the valleys 123. In this way, the gap formed by the diffusion spaces 124 between the second substrate 21 and the diffusion layer 12 is not completely adhered to each other, and the light path is first changed when the light is diffused from the diffusion layer 12. It is incident on the second substrate 21 to realize the light diffusing function of the diffusion sheet 1.

Referring to FIG. 2, the rough surface composed of the peaks 122 and the valleys 123 obtained by scanning electron microscopy (SEM) has a surface roughness controlled at 0.5 micrometers and 2.0 micrometers. between. If the surface roughness is less than 0.5 μm, the number of the diffusion spaces 124 formed by the diffusion sheet 1 and the concentrating sheet 2 is insufficient, and the diffusion effect of the diffusion sheet 1 is reduced; and the surface roughness is When it is larger than 2.0 μm, the tensile force value required for the diffusion sheet 1 to be peeled off from the condensing sheet 2 is lowered, resulting in a decrease in stability after lamination.

In order to prevent the diffusion sheet 1 from being easily peeled off after being adhered to the concentrating sheet 2 or causing relative movement and friction between the diffusion sheet 1 , the ultraviolet ray hardening resin for forming the diffusion layer 12 must be of a type having a strong viscosity, preferably The tensile force required to tear the diffusion layer 12 from the concentrating sheet 2 is controlled to be greater than 200 gf / 25 mm. The first substrate 11 and the second substrate 21 can be prepared using polyethylene terephthalate (PET) or polycarbonate (PC). However, it is not limited by the materials mentioned above, and other flexible transparent materials may be selected without affecting the light-in efficiency of the diffusion sheet 1 and the concentrating sheet 2, and the first in this embodiment. The substrate 11 and the second substrate 21 are prepared using PET. Since the diffusion sheet 1 and the condensing sheet 2 are closely adhered to each other by the adhesion of the diffusion layer 12 itself, the condensing sheet 2 is not scratched by mutual friction, and its optical characteristics are affected. It should be particularly noted that the diffusion layer 12 is composed of a viscous ultraviolet curing resin, so that it can be directly adhered to the second substrate 21 without using a separate bonding glue, and there is no possibility of bonding. The situation in which the glue fills the diffusing spaces 124 to affect the diffusing effect of the diffusing sheet 1 occurs.

In this embodiment, the diffusion sheet 1 and the concentrating sheet 2 are bonded from two sheets to form an integrated optical film, which is only required on the first substrate 11 of the diffusion sheet 1 before shipment. The surfaces of the prisms 221 of the light-incident surface 111 and the light-concentrating layer 22 of the condensing sheet 2 are respectively provided with a protective film, which saves two protective films compared to the unattached film. Further, since the form of the single optical film is increased in thickness and the overall structural strength is relatively increased, it is less likely to cause film deformation due to an external force. Furthermore, considering the number of steps in the assembly, the unbonded diffusion sheet 1 and the concentrating sheet 2 are subjected to two processes in the assembly process of the flat panel display, and the diffusion sheet 1 can be omitted by using the novel integrated optical film. The bonding process of the condensing sheet 2 can reduce the number of assembly man-hours.

Referring to FIGS. 3 and 4, the specific application of the integrated optical film of the present embodiment will be described below through the optical backlight module 3. It should be noted that, when the embodiment is assembled to the edge-lit backlight module 3, the protective film disposed on the diffusion sheet 1 and the concentrating sheet 2 at the time of shipment and shipment is torn off. The edge-lit backlight module 3 includes a reflective mask 31, a light source 32 disposed in the reflective mask 31, a light guide plate 33 connected to the reflective mask 31 and disposed on a side of the light source 32, and a setting The reflection sheet 34 at the bottom of the light guide plate 33, and the diffusion sheet 1, the condensing sheet 2, and an upper condensing sheet 35 are sequentially stacked from the light guide plate 33. The light emitted from the light source 32 is led out by the light guide plate 33 and enters the light incident surface 111 of the diffusion sheet 1, and enters the diffusion layer 12 from the light exit surface 112. The refractive index of the diffusion layer 12 is between 1.4 and Between 1.6, preferably between 1.45 and 1.65; light is then refracted from the peaks 122 and the valleys 123, and by the peaks 122, the valleys 123, and The plurality of diffusion spaces 124 defined by the second substrate 21 are scattered to achieve the effect of atomization. Finally, the concentrating sheet 2 and the upper concentrating sheet 35 correct the traveling direction of the light to achieve the effect of concentrating and brightening. . It is to be noted that, in this embodiment, the second substrate 21 is adjacent to one surface of the diffusion sheet 1 and the light incident surface 111 of the first substrate 11 is a flat surface having no diffusion structure, but in other embodiments, The two surfaces may be coated with a diffusion structure layer to allow light to be applied to the second substrate 21 after entering the light incident surface 111 and the diffusion spaces 124 for the first and second diffusion. The diffusion structure layer adjacent to one side of the diffusion sheet 1 is further diffused to increase the light diffusion effect.

In summary, the diffusion sheet 1 and the concentrating sheet 2 of the integrated optical film of the present invention are connected by mutual adhesion, and the two condensing sheets 2 are not scratched by mutual friction, so that The optical properties are affected, so it is indeed possible to achieve the purpose of the present invention. Further, after the diffusion sheet 1 and the condensing sheet 2 are bonded to each other, the overall structural strength is relatively increased, and it is less likely to cause film deformation due to an external force. In addition, considering the number of processes in the assembly, the unbonded diffusion sheet 1 and the concentrating sheet 2 are subjected to two processes in the assembly process of the backlight module, and after splicing into an integrated film, the diffusion sheet 1 can be omitted. And the bonding process of the condensing sheet 2 can reduce the assembly man-hour.

However, the above is only the embodiment of the present invention, and when it is not possible to limit the scope of the present invention, all the simple equivalent changes and modifications according to the scope of the patent application and the contents of the patent specification are still This new patent covers the scope.

1‧‧‧Diffuse film
11‧‧‧First substrate
111‧‧‧Into the glossy surface
112‧‧‧Glossy
12‧‧‧Diffusion layer
121‧‧‧Diffusion microstructure
122‧‧‧ Peak
123‧‧‧谷部
124‧‧‧Diffuse space
2‧‧‧Spots
21‧‧‧second substrate
22‧‧‧concentrating layer
221‧‧‧ prism
3‧‧‧Side-light backlight module
31‧‧‧Reflective mask
32‧‧‧Light source
33‧‧‧Light guide plate
34‧‧‧reflector
35‧‧‧Uplighting film

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: Figure 1 is a partial side elevational view of one embodiment of the integrated optical film of the present invention; An image obtained by scanning a scanning electron microscope (SEM) of a plurality of peaks and a plurality of valleys of the diffusion microstructure; FIG. 3 is a side view showing a backlight module including a part of the embodiment; And Figure 4 is a partial side elevational view showing the path of light entering the light incident surface of a diffuser.

1‧‧‧Diffuse film

11‧‧‧First substrate

111‧‧‧Into the glossy surface

112‧‧‧Glossy

12‧‧‧Diffusion layer

121‧‧‧Diffusion microstructure

122‧‧‧ Peak

123‧‧‧谷部

124‧‧‧Diffuse space

2‧‧‧Spots

21‧‧‧second substrate

22‧‧‧concentrating layer

221‧‧‧ prism

Claims (15)

An integrated optical film comprising: a diffusion sheet comprising a first substrate, and a diffusion layer disposed on the first substrate and having a diffusion microstructure; and a concentrating sheet comprising an adhesion layer a second substrate on the diffusion layer and a concentrating layer disposed on the second substrate and having a plurality of prisms. The integrated optical film of claim 1, wherein the diffusion microstructure has a plurality of peaks formed toward the concentrating sheet, and a plurality of valleys formed toward the first substrate, the concentrating light The second substrate of the sheet is adhered to the peaks of the portion and does not contact the valleys, and a plurality of diffusion spaces are defined together with the peaks and the valleys. The integrated optical film of claim 2, wherein the diffusion layer is composed of an ultraviolet curable resin. The integrated optical film of claim 3, wherein the diffusion layer has a surface roughness of between 0.5 μm and 2.0 μm. The integrated optical film of claim 4, wherein the diffusion layer has a refractive index between 1.4 and 1.6. The integrated optical film of claim 5, wherein the diffusion layer has a refractive index of between 1.45 and 1.55. The integrated optical film of claim 6, wherein the tensile force required to tear the diffusion layer from the concentrating sheet is greater than 200 gf / 25 mm. The integrated optical film of claim 7, wherein the material of the first substrate and the second substrate is one of polyethylene terephthalate and polycarbonate. A diffusion sheet is used in combination with a concentrating sheet, the diffusion sheet includes: a first substrate; and a diffusion layer disposed on the first substrate, viscous for adhering to the concentrating sheet, and having a diffusion microstructure. The diffusion sheet of claim 9, wherein the diffusion microstructure has a plurality of peaks formed toward the concentrating sheet for adhesion to the concentrating sheet, and a plurality of recesses formed toward the first substrate and Does not touch the valley of the concentrating sheet. The diffusion sheet according to claim 10, wherein the diffusion layer is composed of an ultraviolet curable resin. The diffusion sheet of claim 11, wherein the diffusion layer has a surface roughness of between 0.5 μm and 2.0 μm. The diffusion sheet of claim 12, wherein the diffusion layer has a refractive index between 1.4 and 1.6. The diffusion sheet of claim 13, wherein the diffusion layer has a refractive index of between 1.45 and 1.55. The diffusion sheet of claim 14, wherein the material of the first substrate is one of polyethylene terephthalate and polycarbonate.